The accused say a close aide of former RJD MP Shahabuddin gave them a supari to kill Ranjan.
A proclamation and property attachment notice was on Monday pasted at the house of Laddan Mian, a close associate of jailed ex-Rashtriya Janata Dal MP Mohammad Shahabuddin, in connection with the murder of a journalist in Siwan earlier this month.
Bihar Police Additional Director General Sunil Kumar had earlier said that the five men were engaged by contract killer Mian, known to be close to Shahabuddin.
Ex-RJD MP has been charged with murder and criminal conspiracy in the killing of journalist Rajdeo Ranjan.